fix phpstan error

src/Service/Dolibarr/DolibarrSyncService.php

@@ -774,7 +774,11 @@ class DolibarrSyncService
         );
     }
 
-    protected function getExpectedTagsFor(Organization $organization)
+    /**
+     * @param Organization $organization
+     * @return array<int>
+     */
+    protected function getExpectedTagsFor(Organization $organization): array
     {
         $expectedTags = [];
         $product = $organization->getSettings()->getProduct();